About: http://webisa.webdatacommons.org/290409288

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Cementitious materials may include such materials as cement, fly ash, slag, silica fume, and other pozzolans, and the methods of properly selecting or combining these constituents are known to those of skill in the art.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com